PAT甲级 - 1015 Reversible Primes （20 分）

女爷i 2022-03-17 01:13 336阅读 0赞

题目链接：PAT甲级 - 1015 Reversible Primes （20 分）

A reversible prime in any number system is a prime whose “reverse” in that number system is also a prime. For example in the decimal system 73 is a reversible prime because its reverse 37 is also a prime.

Now given any two positive integers N (<105) and D (1<D≤10), you are supposed to tell if N is a reversible prime with radix D.

Input Specification:

The input file consists of several test cases. Each case occupies a line which contains two integers N and D. The input is finished by a negative N.

Output Specification:

For each test case, print in one line Yes if N is a reversible prime with radix D, or No if not.

Sample Input:

  1. 73 10
  2. 23 2
  3. 23 10
  4. -2

Sample Output:

  1. Yes
  2. Yes
  3. No

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